Compound Interest Calculator
Find out how much your investment will grow over time with the power of compound interest.
How to Use the Compound Interest Calculator
Enter Principal Amount
Input the initial amount you plan to invest or deposit.
Set Annual Interest Rate
Enter the expected annual interest rate in percentage.
Choose Compounding Frequency
Select how often the interest will be compounded (e.g., Yearly, Monthly).
Select Time Period & View
Choose the investment duration in years to instantly view your total interest and maturity amount.
Frequently Asked Questions
What is Compound Interest?
Compound interest is the interest calculated on the initial principal as well as the accumulated interest from previous periods. Often called "interest on interest," it allows wealth to grow at an accelerating rate. It is the core principle behind most long-term wealth creation strategies.
What is the formula for compound interest?
The standard formula is A = P(1 + r/n)^(nt), where A is the final amount, P is the principal, r is the annual interest rate, n is the compounding frequency per year, and t is time in years. The interest generated is simply A - P. Our calculator automates this complex equation.
How does Compound Interest differ from Simple Interest?
Simple interest is calculated only on the original principal amount every year. Compound interest is calculated on the principal plus any previously earned interest. Therefore, compound interest always yields a higher final amount than simple interest over the same period.
How does compounding frequency affect my returns?
The more frequently interest is compounded, the higher your overall returns will be. For example, monthly compounding will generate slightly more interest than annual compounding at the same rate. This is because your interest starts earning its own interest sooner.
What is the Rule of 72?
The Rule of 72 is a quick mental math formula to estimate how long it takes for an investment to double. You simply divide 72 by the annual interest rate. For instance, at an 8% interest rate, your money will double in approximately 9 years (72/8).
Why is compounding called the "eighth wonder"?
Albert Einstein reportedly called compound interest the eighth wonder of the world because of its phenomenal power to multiply wealth over time. The growth curve starts slowly but becomes extremely steep in the later years. This rewards patience and long-term holding.
What are some real-world examples of compounding?
Real-world examples include Bank Fixed Deposits, Public Provident Fund (PPF), Employee Provident Fund (EPF), and Mutual Fund investments. Even credit card debt uses compounding, which is why unpaid balances can grow out of control rapidly.
What is continuous compounding?
Continuous compounding assumes that interest is calculated and added to the balance constantly, at every infinitely small instant. The formula for this is A = Pe^(rt). While rarely used in consumer banking, it represents the absolute mathematical limit of compounding growth.